Fix to avoid deinit of tso seg list and tso num seg list
during pdev detach if the lists are not initialized during
pdev post attach.
Currently, if htt_attach() fails as part of ol_txrx_post_pdev_attach(),
then it immediately returns from the function and not initializes
tso seg lists and during pdev_detach(), host tries to de-initialize
tso seg list and end up in a crash.
CRs-Fixed: 1113347
Change-Id: I91e077496a15a69edb9d41574f846bc3d1b73b31